Grinding machine



March 13, 1945. SCHOTTLAND 2,371,552

GRINDING MACHINE Filed A ril 2,1943 5 Sheets-Sheet 1 44 55 INVENTOR.

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ATTOR/VEKS:

A I I BY :ZZ LAW March 13, 1945.

GRINDING MACHINE E. SCHOTTLAND Y 2,371,552

Filed April 2, 1943 3 Sheets-Sheet 2 I INVENTOR.

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March 13, 1945. SCHQTTLAND 2,371,552

' GRINDING MACHINE Filed April 2, 194; 3 Sheets-Sheet 3 57 INVENTOR.

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BY I

A TTORNEYS.

.that the present bodied.

Machines as generally, employed for perform- Patented Mar. 13, 1945 UNITED: STATES PATENT, OFFICE Edward Schottland, Forest Hills, ,N. Y.,assignor;of

, one-half to Robert Schottland, ackson Heights,

Application April 2, 1943, Serial No. 481,53 r v p 3 Claims. ('01. 51- 263) The present invention relates to new and useful improvements in grinding machines and more particularly it pertains 1 to a grinding machine which employs a rotary grinding wheel to the effective surface of which a :plied.

One good example of a machine of the aforementioned type is a glass grinding machine of the type employed for grinding in glass plates, shallow elongated recesses havin curved bottom walls and commonly referred to in the trade as finger grips and it is in this type of machine invention has been herein em "tain' a constant agitation" of the' abrasive while the machine is in operation; thus making possible an exact'control of the abrasive mixture.

ing the above mentioned operation require two operators in attendance. 1

One of the operators holds the glass plate ito beoperated upon-in grinding relation with the grinding wheeL-while the other .operator applies,

tween quid and abrasive applied to the rm r ing wheel cannot be controlled, and hence, the most efficient operation of the grinding wheel does notresult.

One object of the present invention isto improve the construction and mode of operation of grinding machines of the above mentioned type and to provide such machines withmechanisms which will effecta better grinding operation than any prior machineswith which I am familiar. V

A feature of the .invention resides in the provision of a novel means for applying a fluid abrasive constantly'and uniformly to theef feictive surface of a rotary grinding wheel during the performance of a grinding operation thereby.

The abrasive generally employed in the aforementioned operation consists of a suitable fluid,

.water, for example, in which the abrasive in the form of relatively heavy particles is carried in suspension and which, unless the abrasive is subjected to constant agitation, precipitate through the fluid with the result that its abrasive quali ties are seriously-impaired.

Another feature of the invention resides in a novel construction which functions to mainat intervals, a fluid abrasive to the efiective slit- Still another feature of the invention resides in a'novelconstruction whereby the abrasive agitating means, will, when the machine is not operating, occupy a position out of operative relation with the grinding wheel and which'may be operated to move the abrasive agitating means into operative relation with the grinding wheel inwhich last mentioned position, a portion of the effective surfaceof the grinding wheel will be submerged in the'abrasive.

? This last mentioned feature is important since it assures uniform application of the abrasive to the entire effective surface of the grinding wheel therebymateriallyreducing the grinding period and -consequently increasing the efficiency of the machine. f I Other'features of the invention relate to certainnovel and improved constructions, arrangements and combinations of parts hereinafter detion in its preferred form and the following des cription of the constructions therein shown.

In the drawings,

' Figure 1 is a view in side elevation illustrating a machine embodying the present invention,

Figure 2 is a top plan view thereof,

Figure 3 is a view in front elevation, thereof,

Figure 4 is a fragmentaryyertical sectional view taken substantially on the line 44 of Figure 1, looking in the direction of the arrows,

Figure 5 is avertical sectional view taken substantially on the line 5-5 of Figure 3, and;

Figure 6 is'a detail sectional view of a portion of the machine illustrating the grinding wheel and the abrasive receptacle and their relation to eachother.

Referring to the drawings by reference character, l0 designates a frame, which comprises a substantially rectangular main body portion I I having spaced upstanding arms l2 extending from the'upper side edges of the frame at the forward portion thereof.

These arms are provided on their upper ends with bearings 13 which support a shaft I 4' upon which is mounted a grinding wheel l5. 1 Referring to Figure 3. it will be noted that the right handend of the shaft M is extended there is a shaft 22 and keyed to said shaft 22 and disposed between the arms l9, heretofore mentioned, there is a driving worm 23.

The reference character 25 designates a sec-*- ond frame which comprises a main body portion 26 having an angular extension 21 from which extends a right angular extension 21'.

The frame 25 is mounted upon the shaft 22', I heretofore mentioned, in a manner which will ,permit of a slight pivotal movement about. the shaft, which construction is provided for a purpose which will be hereinafter more specifically described. For mounting the frame-'25 upon the shaft 22 yoke members 28 extend from theunderside of the main body portion 26 of the frame which yoke members carry bearings through which the shaft 22 passes.

The frame 25 occupies a position in a plane at an angle of approximately 45 to the vertical. This frame is adapted for adjustment relative to the grinding. wheel and the frame ill by rocking it about the shaft 22 and it is mounted rigidly in its adjusted position preferably by means of threebol-ts 23, 23, and 30.

The two bolts 28 and 29' have threaded engagement with the stationary frame l0, each being loosely mounted in the angular extension?! of the frame 25; one of which bolts is illustrated in Figure 5.. The bolt 30 has threaded engagement with the stationary frame l0 and its free end engages the underside of the angular extension 21 of the frame 25 as at 33' in Figure 5.

By this construction, the bolt forms a stop to position. the frame 25, while. the bolts 29 and23 serve to retain the frame 25 in rigid engagement with the stop 30 when said bolts are tightened, thusprovidingmeans for adjusting the frame 25 relative to the frame H1 and the grinding wheel.

Upon the lower end of the body portion 26 of the frame 25 there are two spaced bearings 3!. These bearings support the lower end of ashaft 32, the opposite end of which is supported in a bearing 33 at the upper end of the body portion 26 of the frame 25, and, as best illustrated in Figure 5, a portion 34 of the shaft 32 extends beyond the upper bearing 33, heretofore mentioned.

Mounted upon the shaft 32 between the bearings 3! there is a worm gear 35 which meshes with.

the driving worm 23, heretofore mentioned. The worm gear 35 is keyed to the shaft 32 in such a manner that the shaft may have sliding movement in the hub portion 36 of the worm gear and at the same'time establish a driving connection between the worm gear 35 and the shaft 32.

' The reference character 31 designates a thrust bearing preferably of the roller bearing type which is carried by the shaft 32 and keyed thereto as indicated at 33 in Figure 5 of the drawings. The thrust bearing 31 is slightly spaced with respect to the bearing 3! and slidably mounted upon the shaft and upon the body portion 26 of the frame 25 between the bearing 3i and said thrust bearing, there is a shoe or the like 38'. f

" The shoe 38' is moved longitudinally of the shaft 32 by means of cables, cords or the like 33, which are connected to the shoe as at 43 at opposite sides thereof as best illustrated in Figures 1 and 2.

These cords or cables 33 pass over pulleys 4| carried by the body portion 26 of the frame 25 and they are connected to a cross member 42 which in turn; is connected: by meansof a suitable pull cable or the like 43' with an arcuate member 44, see Figures 3 and 4, which arcuate member is keyed to a tubular shaft 45, see Figure 5, mounted in the lower portion of the frame I0. The shaft 45 carries a foot lever 46 for rocking the shaft 45 to in turn rockthe arcuate member 44 to exert "a downward" pull upon the connecting member 43, to operate the pull cables or cords 33 to move th'eshoeild' upwardly of the frame 25 thereby to slide the shaft 32 in its bearings 3| and 33 through the medium of the thrust bearing 31, heretofore mentioned. I

Thus,.it=willbe. apparentthat when the operator applies; pressure to the.- foot lever 46, the tubular shaft 45 will be partially rotated and it will'partially rotate the arcuate member 44. to exert a pull upon the connecting cables or cords 43 and 39. to-impart a sliding movement to the shaft-32.

The reference. numeral 41 designates a weight which maybe carried by the cross member 42 and which serves to partially counter balance the weight of the shaft 32, the shoe 38', the thrust bearing 3'l..-and other" elements: associated withthe shaft 32in order to minimize the effort required to slide the shaft 32in its bearings.

The reference character 50 designates areceptacle for containing an abrasive material or" an abrasive element which consists of a suitable fluid adapted to carry a suitable abrasive material in suspension'therein during a grinding operation. Theabrasive receptacle 50 has a main body portion "5! of substantially inveitedfrusto-conical shape from the peripheral edge of which projects acontinuous flange 52. M

This receptacle is best illustrated in Figure 6 of the drawings and by reference to saidfigure it'will be noted that it; is provided with a socket member 53 for receiving th extended end 34, heretofore mentioned, of the shaft 32 to'which it is keyed o'r operatively connected by a, cross key 54. The several parts thus far described are so proportioned and positioned that the abrasive receptacle when in position upon the upper end of the shaft will enclose or receive a. portion of the grinding wheel as best illustrated in Figures n in addition to. the abrasive receptacle, the grinding wheel I5 is. partially enclosed by two hoods or guards 55 and 56,. both of. which extend partially into the open end of the abrasive receptacle as best illustrated in Figure 6. The hood or guard 55 is both transversely and longitudinally curved and encloses a portion of the. upper portion of the grinding wheel. l5 and it. is. connected rigidly'tothe upper ends of the arms I 2 of the. frame 10 by means of plates or the like 58-, which plates serve to hold the hood or guard rigidly in position.

.The hood orguard 56 partially encloses the forframe 25.

Referring to Figure 6, it will be apparent that thehoodor guard-is so shaped and proportioned thatitsmaln body portion -56'. occupies a position relatively close to the adjacent wall 57' of the acts also as a baliiein the path of the revolvingabrasive 'material and serves to break up the centrifugal action upon the abrasive material at the lowest point of the abrasive receptacle, thus preventing discharge of abrasive during rotation of the receptacle.

The abrasive element is preferably employed in such a quantity that when the machine is at rest, the level thereof will be below the lowest point of the grinding wheel. This position of the parts is illustrated in Figure of the drawings.

When it is desired to perform a grinding op eration, the motor 2t is started whereupon the grinding wheel It will be driven through the medium of the belt I! in the manner heretofore described and the shaft .32 will be rotated through the medium of the driving worm 23 and the Worm gear 35. Since the abrasive receptacle 5B is carried by the shaft 32, the rotary movement of said shaft will also impart a rotary motion to said receptacle which motion will produce a swirling action of the abrasive material within the receptacle 50 thereby to agitate the same and maintain the particles of the abrasive contained therein in suspension in the fluid as long as the rotating motion of the receptacle 50 is maintained.

With the parts operating the positions just described, the operator exerts pressure upon the foot lever 46 to reciprocate the shaft 32 in its bearings 31 and 33 in the manner heretofore described, which action slides the shaft 32 in its bearings 3| and 33 to move the abrasive receptacle in the direction of thegrinding wheel 15 to the position where the lower portion of the grinding wheel will be immersed in the abrasive element to a sufiicient depth to pick up the required amount of abrasive material to perform a grinding operation.

With the machine operating as thus far de scribed, the operator positions a glass plate, such as designated A in Figure 6, engaging the face thereof with the grinding wheel l5 to form the so-called finger grip recess in the plate. Merely by imparting a reciprocating movement to the plate A, the recess ground therein may be made of any desired length.

Means is provided to retain the abrasive receptacle in elevated or operative position with respect to the grinding wheel and this means includes a shaft .60, see Figure 5, mounted within the tubular shaft 45, heretofore mentioned. On

its forward end, the shaft 60 carries a foot lever' B I. Upon its rear extremity, it carries a lever 62 which is connected by means of a spring 63 to the frame 10. The reference character 64 designates a pawl which is pivotally connected as at 65 in an arm 66 extending from the stationary frame Ill. Atttached to the pawl 64 there is an arm or lever 61 which is connected with the lever 62 by means of a rod 68. The pawl 64 is adapted to engage a lug 70 upon the curved face of the arcuate member 44 when the same is rocked in the downward direction to elevate the shaft 32 rocking of the arcuate member 44 in the downward direction.

To release the holding engagement of the pawl 64, pressure is applied to the foot lever 6| which rocks the shaft 60 to the right in Figure 4 against the tension of the spring 83. Through the me dium of the rod 63 and the arm or lever 65, the pawl 64 will be rocked out of engagement with the lug l0 permitting the arcuate member 44 to rock in an upward direction and move the shaft 32 and the abrasive receptacle to their normal positions under the influence of gravity.

From the foregoing, it will be apparent that the present invention provides a machine in which the desired grinding operation may be expeditiously carried out.

Furthermore, the invention provides for constant agitation of the abrasive material and its constant and uniform application to the grinding wheel in a manner which permits of efficient op eration of the machine with but a single attendant or operator.

Having thus described the invention, what is claimed as new is:

1. A machine of the type described comprising in combination, a stationary frame, a grinding wheel mounted for rotation in a fixed position on said frame, means for driving said grinding wheel, a second frame pivotally mounted upon I the first mentioned frame, a shaft slidably mounted in said second mentioned frame and disposed thereon at an angle to the vertical, an

the abrasive receptacle in operative relation with the grinding wheel.

2. A machine of the type described comprising in combination, a stationary frame, a grinding wheel mounted for rotation in a fixed position on said frame, means for driving said grinding wheel,

a second frame carried by the stationary frame, an abrasive receptacle, means for slidably mounting the abrasive receptacle upon the second mentioned frame, means for rotating the abrasive receptacle to impart an agitating action thereto,

and means. for moving the abrasive receptacle into and out of operative relation with the grinding wheel.

3. A machine of the type described comprising in combination, a stationary frame, a grinding and the abrasive receptacle 50 in the manner heretofore described. r

The pawl is normally held in constant engagement with the curved face of the arcuate member by the spring 63 whereupon the engagement of wheel mounted for rotation in a fixed position on. said stationary frame, means for driving said grinding wheel, a second frame, means for pivotally mounting the second mentioned frame upon the'stationary frame to provide for its adjustment relative thereto, a shaft, means for mount-- ing the shaft for sliding and rotating movement upon the second mentioned frame, an abrasive receptacle carried by said shaft, means for ro-' tating said shaft to impart an agitating action to the abrasive receptacle, and means for reciprocating said shaft to move the abrasive receptacle into and out of operative position relative to the grinding wheel.

EDWARD SCI-IO'I'ILAND.

the pawl 64 with the lug 10 is automatic upon 

